He distributes products for someone else in return for commission; can he increase the price of the products?

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Check below answers in case you are looking for other related questions:
Is it permissible for a daughter to pay zakaat al-fitr on behalf of her father?
His boss gave him the job of following up on some technical drawings, and he managed to save some money on that

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Related Answers:
His deputy gave the zakaah of his wealth in the form of foodstuff; is that acceptable or does he have to give it again?
Agent taking payment for doing something on behalf of another
He was asked to sell the product for a specific price but he is selling it for more and keeping the difference
Is it permissible for a daughter to pay zakaat al-fitr on behalf of her father?
His boss gave him the job of following up on some technical drawings, and he managed to save some money on that

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